Plug-in Fixed Optical Attenuator can reduce the optical light power at a fixed level,Variable fiber optic attenuators are with adjustable attenuation range. There are also attenuation fiber optic patch cables available, their function is same as attenuators and are used inline. Opelink’s Fixed Fiber Optic Attenuator features high power endurance and low backreflection, suitable for high speed digital transmission and analog applications.Available in singlemode or multimode, FC,SC, ST,MU and LC type.